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High‐Pressure Sintering of Rhombohedral Cr 2 S 3 Using Titanium–Zirconium–Molybdenum Tools
Author(s) -
Groeneveld Dennis,
Groß Hendrik,
Hansen Anna-Lena,
Dankwort Torben,
Hansen Julian,
Wöllenstein Jürgen,
Bensch Wolfgang,
Kienle Lorenz,
König Jan
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201900430
Subject(s) - sintering , materials science , spark plasma sintering , zirconium , metallurgy , titanium , molybdenum , alloy , powder metallurgy , analytical chemistry (journal) , chemistry , chromatography
The influence of sintering parameters on the physical properties and the chemical structure of rhombohedral Cr 2 S 3 (rh‐Cr 2 S 3 ) is investigated using high pressures and high temperatures. The densification of the powder is performed by applying the high‐pressure field‐assisted sintering technique/spark plasma sintering. Using a titanium–zirconium–molybdenum (TZM) alloy as sintering tool, it is possible to increase the magnitude of the applied pressure to several hundred MPa at temperatures as high as 1223 K. A relative density of up to 99.9% is achieved at a sintering temperature of 1223 K and a pressure of 395 MPa. The presence of phase‐pure rh‐Cr 2 S 3 is proven by X‐ray diffraction analysis and transmission electron microscopy. The Seebeck coefficients of the self‐doped samples change drastically with the sintering temperatures ranging between −650 and −350 μV K −1 . The densities and the thermal conductivities of the sintered samples increase with increasing sintering temperatures. The electrical conductivity is largely increased compared with the thermal conductivity potentially due to the current‐assisted high‐pressure sintering.